Organic light emitting display device

ABSTRACT

An organic light emitting display device includes a plurality of pixels defined on a substrate. Each of the plurality of pixels has a plurality of sub-pixels, and each of the plurality of sub-pixels has a light emitting area and a driving area. Widths in a first direction of the driving areas of the plurality of sub-pixels are identical to each other. A size of a light emitting area of a first sub-pixel of the plurality of sub-pixels is greater than a size of a light emitting area of a second sub-pixel of the plurality of sub-pixels.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.14/692,966, filed on Apr. 22, 2015, which claims the benefit of KoreanPatent Application No. 10-2014-0048968 filed on Apr. 23, 2014 and KoreanPatent Application No. 10-2015-0037346 filed on Mar. 18, 2015, all ofwhich are hereby incorporated by reference.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to an organic light emitting displaydevice, and more particularly, to an organic light emitting displaydevice having an aperture ratio for each sub-pixel without making achange in driving elements.

Description of the Related Art

An organic light emitting display device (OLED), unlike a liquid crystaldisplay (LCD) device, is a self-light emitting display device that doesnot need a separate light source, and, thus, the OLED can be madethinner. Further, the OLED has advantages in that it is driven with alow voltage to consume less power. Also, the OLED has excellent colorexpression ability, a high response time, a wide viewing angle, and ahigh contrast ratio (CR). Therefore, the OLED has been acknowledged as anext-generation display device.

FIG. 1 is a cross-sectional view provided to describe a typical organiclight emitting display device. FIG. 1 illustrates a cross section of asub-pixel SP of a general bottom-emission organic light emitting displaydevice 100 for convenience in explanation. The bottom-emission organiclight emitting display device refers to an organic light emittingdisplay device in which a light emitted from an organic light emittingelement is released toward the bottom of the organic light emittingdisplay device. Also, the bottom-emission organic light emitting displaydevice refers to an organic light emitting display device in which alight emitted from an organic light emitting element is released towardthe bottom of a substrate on which a thin film transistor for drivingthe organic light emitting display device is formed.

Referring to FIG. 1, a thin film transistor 120 as a driving element fordriving an organic light emitting element 130 is formed in a drivingarea DA on a substrate 110, and an overcoating layer 151 for planarizingan upper part of the thin film transistor 120 and a color filter 140 isformed. An organic light emitting element 130 including an anode 131electrically connected with thin film transistor 120, an organic lightemitting layer 132, and a cathode 133 is formed on the overcoating layer151. If the organic light emitting display device 100 is abottom-emission organic light emitting display device, the anode 131 isformed of a transparent conductive material having a high work functionvalue and the cathode 133 is formed of a reflective metallic materialhaving a low work function value. The organic light emitting layer 132is an organic light emitting layer for emitting white light. A lightemitted from the organic light emitting layer 132 passes through thecolor filter 140 and is emitted toward the bottom of the substrate 110on which the thin film transistor 120 is formed. A bank layer 152 isformed on the overcoating layer 151 and defines a light emitting areaEA.

Generally, a pixel of an organic light emitting display device includesa plurality of sub-pixels. The respective sub-pixels are configured toemit lights of different colors from each other. Therefore, it istechnically important to secure an aperture ratio for each sub-pixel toachieve an optimum luminance for each color. Herein, the aperture ratiorefers to a ratio of a light emitting area to a sub-pixel. Optimizationof the aperture ratio is closely involved in improving the life of anorganic light emitting element.

In the sub-pixel SP of the organic light emitting display device 100illustrated in FIG. 1, a light emitted from the organic light emittingelement 130 cannot be emitted through the driving area DA in which thedriving element such as the thin film transistor 120 is formed.Therefore, it is very difficult to secure an aperture ratio in anorganic light emitting display device.

A method of reducing the size of a driving area in a sub-pixel may beconsidered in order to secure an aperture ratio in an organic lightemitting display device. However, a driving area in a sub-pixel isoptimized by considering the characteristics of an actual product.Therefore, if the number and/or a size of thin film transistors orcapacitors disposed in the driving area are reduced to reduce a size ofthe driving area, reliability of an organic light emitting displaydevice may decrease.

Meanwhile, a method of increasing a size of a pixel may be considered inorder to secure an aperture ratio in an organic light emitting displaydevice. However, a size of a pixel in an organic light emitting displaydevice is determined by resolution of the organic light emitting displaydevice. Particularly, in a high-resolution organic light emittingdisplay device, a size of a sub-pixel is very small. Therefore, sincethe size of a pixel is limited by the resolution of the organic lightemitting display device, it is practically impossible to secure anaperture ratio by increasing a size of a pixel.

SUMMARY

Accordingly, the present invention is directed to an organic lightemitting display device that substantially obviates one or more of theproblems due to limitations and disadvantages of the related art.

Accordingly, an object of the present invention is to provide an organiclight emitting display device capable of providing different apertureratios for respective sub-pixels included in a pixel without making achange in a size of the pixel and a size of a driving area.

Another object of the present invention is to provide an organic lightemitting display device with improved reliability and life where a sizeof a light emitting area of each sub-pixel is provided so as to besuitable for a current required for each sub-pixel.

Yet another object of the present invention is to provide an organiclight emitting display device in which a size light emitting area ofeach sub-pixel is determined by considering efficiency of an organiclight emitting element in each sub-pixel.

Additional features and advantages of the invention will be set forth inthe description which follows, and in part will be apparent from thedescription, or may be learned by practice of the invention. Theobjectives and other advantages of the invention will be realized andattained by the structure particularly pointed out in the writtendescription and claims hereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purposeof the present invention, as embodied and broadly described, an organiclight emitting display device comprises a plurality of pixels defined ona substrate, wherein each of the plurality of pixels includes aplurality of sub-pixels, each of the plurality of sub-pixels includes alight emitting area and a driving area, widths in a first direction ofthe driving areas of the plurality of sub-pixels are identical to eachother, and a size of a light emitting area of a first sub-pixel of theplurality of sub-pixels is greater than a size of a light emitting areaof a second sub-pixel of the plurality of sub-pixels.

In another aspect, an organic light emitting display device comprises aplurality of first lines extending in a first direction on a substrate;a plurality of second lines intersecting the plurality of first linesand extending in a second direction on the substrate; and a redsub-pixel, a white sub-pixel, a blue sub-pixel, and a green sub-pixeleach including a light emitting area and a driving area on thesubstrate, wherein a driving area of the red sub-pixel, a driving areaof the white sub-pixel, a driving area of the blue sub-pixel, and adriving area of the green sub-pixel are identical in width to each otherin the first direction, and wherein a size of a light emitting area ofthe blue sub-pixel and a size of a light emitting area of the whitesub-pixel are greater than a size of a light emitting area of the greensub-pixel and a size of a light emitting area of the red sub-pixel,respectively.

In yet another aspect, an organic light emitting display devicecomprises first lines, second lines, and a plurality of pixels on asubstrate, wherein each of the plurality of pixels includes plurality ofsub-pixels including a light emitting area and a driving area, sizes ofthe driving areas of the plurality of sub-pixels are identical to eachother, and sizes of the light emitting areas of the plurality ofsub-pixels are different from each other due to an slanted portion of atleast one of the second lines.

It is to be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and areintended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the invention andtogether with the description serve to explain the principles of theinvention. In the drawings:

FIG. 1 is a cross-sectional view provided to describe a typical organiclight emitting display device;

FIG. 2 is a schematic diagram provided to describe a light emitting areaand a driving area in each of a plurality of sub-pixels of an organiclight emitting display device according to an exemplary embodiment ofthe present invention; and

FIGS. 3 to 6 are plane views provided to describe organic light emittingdisplay devices according to various exemplary embodiments of thepresent invention.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

Advantages and features of the present invention, and methods foraccomplishing the same will be more clearly understood from exemplaryembodiments described below with reference to the accompanying drawings.However, the present invention is not limited to the following exemplaryembodiments but may be implemented in various different forms. Theexemplary embodiments are provided only to complete disclosure of thepresent invention and to fully provide a person having ordinary skill inthe art to which the present invention pertains with the category of theinvention, and the present invention will be defined by the appendedclaims.

The shapes, sizes, ratios, angles, numbers, and the like illustrated inthe accompanying drawings for describing the exemplary embodiments ofthe present invention are merely examples, and the present invention isnot limited thereto. Like reference numerals generally denote likeelements throughout the present specification. Further, in the followingdescription, a detailed explanation of known related technologies may beomitted to avoid unnecessarily obscuring the subject matter of thepresent disclosure. The terms such as “including,” “having,” and“consist of” used herein are generally intended to allow othercomponents to be added unless the terms are used with the term “only”.Any references to singular may include plural unless expressly statedotherwise.

Components are interpreted to include an ordinary error range even ifnot expressly stated.

When the position relation between two parts is described using theterms such as “on”, “above”, “below”, and “next”, one or more parts maybe positioned between the two parts unless the terms are used with theterm “immediately” or “directly” is not used.

When an element or layer is referred to as being “on” another element orlayer, it may be directly on the other element or layer, or interveningelements or layers may be present.

Although the terms “first”, “second”, and the like are used fordescribing various components, these components are not confined bythese terms. These terms are merely used for distinguishing onecomponent from the other components. Therefore, a first component to bementioned below may be a second component in a technical concept of thepresent invention.

Throughout the whole specification, the same reference numerals denotethe same elements.

Since size and thickness of each component illustrated in the drawingsare represented for convenience in explanation, the present invention isnot necessarily limited to the illustrated size and thickness of eachcomponent.

The features of various embodiments of the present invention can bepartially or entirely bonded to or combined with each other and can beinterlocked and operated in technically various ways as can be fullyunderstood by a person having ordinary skill in the art, and theembodiments can be carried out independently of or in association witheach other.

Various exemplary embodiments of the present invention will be describedin detail with reference to the accompanying drawings.

FIG. 2 is a schematic diagram provided to describe a light emitting areaand a driving area in each of a plurality of sub-pixels of an organiclight emitting display device according to an exemplary embodiment ofthe present invention. For convenience in explanation, FIG. 2schematically illustrates a pixel P, sub-pixels SP_R, SP_W, SP_B, andSP_G, and light emitting areas EA_R, EA_W, EA_B, and EA_G and drivingareas DA_R, DA_W, DA_B, and DA_G of the respective sub-pixels SP_R,SP_W, SP_B, and SP_G. In FIG. 2, borders of the sub-pixels SP_R, SP_W,SP_B, and SP_G are indicated by solid lines, and borders between thelight emitting areas EA_R, EA_W, EA_B, and EA_G and the driving areasDA_R, DA_W, DA_B, and DA_G within the respective sub-pixels SP_R, SP_W,SP_B, and SP_G are indicated by dotted lines.

An organic light emitting display device 200 includes a plurality ofpixels P defined on a substrate. Specifically, each pixel P has a squareshape and may have a rectangular shape. A size of the pixel P isdetermined by characteristics of a product such as a screen size andresolution of the organic light emitting display device 200. In FIG. 2,only one pixel of the plurality of pixels P of the organic lightemitting display device 200 is illustrated for convenience inexplanation.

Each of the plurality of pixels P includes a plurality of sub-pixelsSP_R, SP_W, SP_B, and SP_G. The plurality of sub-pixels SP_R, SP_W,SP_B, and SP_G include a red sub-pixel SP_R for emitting a red light, awhite sub-pixel SP_W for emitting a white light, a blue sub-pixel SP_Bfor emitting a blue light, and a green sub-pixel SP_G for emitting agreen light. Since the organic light emitting display device 200according to the exemplary embodiment of the present invention includesthe white sub-pixel SP_W for emitting a white light in addition to thered sub-pixel SP_R, the green sub-pixel SP_G, and the blue sub-pixelSP_B, luminance of the organic light emitting display device 200 can beimproved.

The plurality of sub-pixels SP_R, SP_W, SP_B, and SP_G within the pixelP are disposed in sequence in a first direction. That is, as illustratedin FIG. 2, the white sub-pixel SP_W is disposed on one side of the redsub-pixel SP_R so as to be adjacent to each other in the firstdirection. The blue sub-pixel SP_B is disposed on one side of the whitesub-pixel SP_W so as to be adjacent to each other in the firstdirection, and the green sub-pixel SP_G is disposed on one side of theblue sub-pixel SP_B so as to be adjacent to each other in the firstdirection. The first direction may be an X-axis direction as illustratedin FIG. 2. Although FIG. 2 illustrates that the red sub-pixel SP_R, thewhite sub-pixel SP_W, the blue sub-pixel SP_B, and the sub-pixel SP_Gare disposed in sequence, the present invention is not limited thereto.An arrangement sequence of the plurality of sub-pixels SP_R, SP_W, SP_B,and SP_G may be changed in various ways.

Referring to FIG. 2, each of the plurality of sub-pixels SP_R, SP_W,SP_B, and SP_G have a shape extending in a second direction. In otherwords, as illustrated in FIG. 2, each of the red sub-pixel SP_R, thewhite sub-pixel SP_W, the blue sub-pixel SP_B, and the green sub-pixelSP_G have a shape elongated in the second direction from one side of thepixel P. The second direction refers to a different direction from thefirst direction. For example, the second direction may be a Y-axisdirection perpendicular to the first direction as illustrated in FIG. 2,but is not limited thereto.

The plurality of sub-pixels SP_R, SP_W, SP_B, and SP_G respectivelyinclude light emitting areas EA_R, EA_W, EA_B, and EA_G in which organiclight emitting elements are disposed to emit lights to the outside ofthe organic light emitting display device 200 and driving areas DA_R,DA_W, DA_B, and DA_G in which driving elements such as thin filmtransistors for driving the organic light emitting elements aredisposed. In the organic light emitting display device 200 according tothe exemplary embodiment of the present invention, the light emittingareas EA_R, EA_W, EA_B, and EA_G and the driving areas DA_R, DA_W, DA_B,and DA_G of the respective sub-pixels SP_R, SP_W, SP_B, and SP_G areseparate areas each other so as not to be overlapped. FIG. 2 illustratesthat the light emitting areas EA_R, EA_W, EA_B, and EA_G and the drivingareas DA_R, DA_W, DA_B, and DA_G of the respective sub-pixels SP_R,SP_W, SP_B, and SP_G have rectangular shapes for convenience inexplanation, but shapes of the light emitting areas EA_R, EA_W, EA_B,and EA_G and the driving areas DA_R, DA_W, DA_B, and DA_G are notlimited thereto.

Sizes of the driving areas DA_R, DA_W, DA_B, and DA_G of the respectivesub-pixels SP_R, SP_W, SP_B, and SP_G are determined on the basis ofvarious characteristics of a product such as resolution and a currentrequired for each sub-pixel of the organic light emitting display device200 and characteristics of the organic light emitting elements. Forexample, a size of the pixel P may be first determined on the basis ofthe resolution of the organic light emitting display device 200, andsizes of the driving areas DA_R, DA_W, DA_B, and DA_G of the respectivesub-pixels SP_R, SP_W, SP_B, and SP_G may be determined on the basis ofa current required for each sub-pixel for driving each of the sub-pixelsSP_R, SP_W, SP_B, and SP_G included in the pixel P. Then, the sizes ofthe driving areas DA_R, DA_W, DA_B, and DA_G can be optimized on thebasis of the characteristics of the organic light emitting elementsdisposed on the respective sub-pixels SP_R, SP_W, SP_B, and SP_G. Theabove-described determination method is just one example, but thepresent invention is not limited thereto.

Referring to FIG. 2, first directional widths d1, d2, d3, and d4 of thedriving areas DA_R, DA_W, DA_B, and DA_G of the respective sub-pixelsSP_R, SP_W, SP_B, and SP_G are identical to each other. That is, thefirst directional width d1 of the driving area DA_R of the red sub-pixelSP_R, the first directional width d2 of the driving area DA_W of thewhite sub-pixel SP_W, the first directional width d3 of the driving areaDA_B of the blue sub-pixel SP_B, and the first directional width d4 ofthe driving area DA_G of the green sub-pixel SP_G are identical to eachother. Therefore, as illustrated in FIG. 2, if the sizes of the drivingareas DA_R, DA_W, DA_B, and DA_G of the respective sub-pixels SP_R,SP_W, SP_B, and SP_G are identical to each other, second directionalwidths of the driving areas DA_R, DA_W, DA_B, and DA_G of the respectivesub-pixels SP_R, SP_W, SP_B, and SP_G may also be identical to eachother. Further, if the sizes of the driving areas DA_R, DA_W, DA_B, andDA_G of the respective sub-pixels SP_R, SP_W, SP_B, and SP_G aredifferent from each other, the second directional widths of the drivingareas DA_R, DA_W, DA_B, and DA_G of the respective sub-pixels SP_R,SP_W, SP_B, and SP_G may be different from each other.

In the present specification, being identical in width between twocomponents means not only that the two components have exactly the samewidth, but also that the two components can be considered havingsubstantially the same width although they do not have exactly the samewidth.

A size of a light emitting area of one sub-pixel of sub-pixels SP_R,SP_W, SP_B, and SP_G adjacent to each other is greater than a size ofalight emitting area of the other sub-pixel. Herein, the white sub-pixelSP_W or the blue sub-pixel SP_B has a relatively large light emittingarea, and the red sub-pixel SP_R or the green sub-pixel SP_G has arelatively small light emitting area. In the organic light emittingdisplay device 200 according to the exemplary embodiment of the presentinvention, in order to improve the luminance of the light emitting areaEA_B of the blue sub-pixel SP_B having a relatively short life ascompared with the other sub-pixels SP_R and SP_G and the overallluminance of the organic light emitting display device 200, a size ofthe light emitting area EA_W of the white sub-pixel SP_W needs to be setgreater than sizes of the light emitting areas EA_R and EA_G of theother sub-pixels SP_R and SP_G, and, thus, life and luminance of theorganic light emitting display device 200 can be improved.

Referring to FIG. 2, a size of the light emitting area EA_W of the whitesub-pixel SP_W is greater than a size of the light emitting area EA_R ofthe red sub-pixel SP_R adjacent to the white sub-pixel SP_W. Inparticular, the light emitting area EA_W of the white sub-pixel SP_Wincludes a portion extending into the red sub-pixel SP_R. Therefore, afirst directional width d6 of the light emitting area EA_W of the whitesub-pixel SP_W is greater than a first directional width d5 of the lightemitting area EA_R of the red sub-pixel SP_R. Likewise, a size of thelight emitting area EA_B of the blue sub-pixel SP_B is greater than asize of the light emitting area EA_G of the green sub-pixel SP_Gadjacent to the blue sub-pixel SP_B. Also, the light emitting area EA_Bof the blue sub-pixel SP_B includes a portion extending into the greensub-pixel SP_G. Therefore, a first directional width d7 of the lightemitting area EA_B of the blue sub-pixel SP_B is greater than a firstdirectional width d8 of the light emitting area EA_G of the greensub-pixel SP_G.

Generally, a size of a pixel in an organic light emitting display deviceis determined by resolution of the organic light emitting displaydevice. That is, an organic light emitting display device having a highresolution is formed of small-sized pixels than an organic lightemitting display device having a low resolution, and each of the pixelsis formed of plurality of sub-pixels. The plurality of sub-pixels isconfigured as an area for emitting lights of specific colors. Thus, itis important to achieve an optimum luminance for a color of a lightemitted from each sub-pixel. Particularly, it is important to secure anaperture ratio for each sub-pixel. However, as described above, if anorganic light emitting display device is designed as an organic lightemitting display device having a high resolution, a pixel itself issmall, and, thus, it is difficult to secure an aperture ratio for eachsub-pixel in the pixel. Particularly, in the sub-pixels SP_R, SP_W,SP_B, and SP_G of the organic light emitting display device 200according to the exemplary embodiment of the present invention, thedriving areas DA_R, DA_W, DA_B, and DA_G for driving elements such asthin film transistors disposed on the substrate of the respectivesub-pixels SP_R, SP_W, SP_B, and SP_G cannot emit lights. Thus, it isdifficult to secure an aperture ratio in the organic light emittingdisplay device 200. Further, generally, a driving area of a sub-pixel isoptimized to work effectively in a product. Thus, reducing the size ofthe driving area of the sub-pixel negatively affects the performance andreliability of an organic light emitting element. Therefore, in a pixelhaving a limited size, it is difficult to secure an aperture ratio ofeach sub-pixel without making a change in a size of the pixel and a sizeof a driving area of each optimally designed sub-pixel. That is, it isdifficult to have desired resolution by having a suitable size of apixel to have, and, thus, there is a limit in securing a desiredaperture ratio suitable for each sub-pixel. Therefore, in the presentinvention, a shape of a line is changed without changing a size of adriving area in a sub-pixel, thereby securing a desired aperture ratiofor each sub-pixel.

In the organic light emitting display device 200 according to theexemplary embodiment of the present invention, optimum aperture ratiosfor the respective sub-pixels SP_R, SP_W, SP_B, and SP_G are provided bychanging only sizes of the light emitting areas EA_R, EA_W, EA_B, andEA_G of the respective sub-pixels SP_R, SP_W, SP_B, and SP_G withoutchanging a size of the optimally designed pixel P or sizes of thedriving areas DA_R, DA_W, DA_B, and DA_G of the respective sub-pixelsSP_R, SP_W, SP_B, and SP_G. To be specific, in a state where the widthd1 of the driving area DA_R of the red sub-pixel SP_R, the width d2 ofthe driving area DA_W of the white sub-pixel SP_W, the width d3 of thedriving area DA_B of the blue sub-pixel SP_B, and the width d4 of thedriving area DA_G of the green sub-pixel SP_G are maintained identicalto each other, the width d6 of the light emitting area EA_W of the whitesub-pixel SP_W and the width d7 of the light emitting area EA_B of theblue sub-pixel SP_B may be set to be greater than the width d5 of thelight emitting area EA_R of the red sub-pixel SP_R and the width d8 ofthe light emitting area EA_G of the green sub-pixel SP_G. Thus, in thepixel P with the limited size, the width d6 of the light emitting areaEA_W of the white sub-pixel SP_W and the width d7 of the light emittingarea EA_B of the blue sub-pixel SP_B can be increased to improve lifeand luminance of the organic light emitting display device 200 withoutchanging sizes of the driving areas DA_R, DA_W, DA_B, and DA_G of therespective sub-pixels SP_R, SP_W, SP_B, and SP_G. Therefore, life andluminance of an organic light emitting display device can be improvedwithout deteriorating the reliability of the organic light emittingdisplay device.

FIG. 3 is a plane view provided to describe an organic light emittingdisplay device according to an exemplary embodiment of the presentinvention. Referring to FIG. 3, an organic light emitting display device300 includes a plurality of first lines 360 disposed on a substrate 310,a plurality of second lines 370, a red sub-pixel SP_R, a white sub-pixelSP_W, a blue sub-pixel SP_B, and a green sub-pixel SP_G. FIG. 3illustrates only driving thin film transistors 320 without a switchingthin film transistor or a capacitor among various driving elements fordriving an organic light emitting element for convenience inexplanation.

The plurality of first lines 360 are disposed so as to extend in a firstdirection on the substrate 310. The first direction may be in X-axisdirection as illustrated in FIG. 3. The first lines 360 are configuredas scan lines for applying scan signals to the thin film transistors 320disposed in a driving area DA_R of the red sub-pixel SP_R, a drivingarea DA_W of the white sub-pixel SP_W, a driving area DA_B of the bluesub-pixel SP_B, and a driving area DA_G of the green sub-pixel SP_G,respectively.

The plurality of second lines 370 are disposed so as to extend in asecond direction on the substrate 310, and intersect the plurality offirst lines 360 extended in the first direction. For example, the seconddirection may be in a Y-axis direction perpendicular to the firstdirection as illustrated in FIG. 3, but is not limited thereto. Thefirst lines 360 are configured as lines for applying data signals to thethin film transistors 320 disposed in the driving area DA_R of the redsub-pixel SP_R, the driving area DA_W of the white sub-pixel SP_W, thedriving area DA_B of the blue sub-pixel SP_B, and the driving area DA_Gof the green sub-pixel SP_G, respectively.

The Plurality of pixels are defined on the substrate 310, and theyinclude the red sub-pixel SP_R, the white sub-pixel SP_W, the bluesub-pixel SP_B, and the sub-pixel SP_G as illustrated in FIG. 3. The redsub-pixel SP_R, the white sub-pixel SP_W, the blue sub-pixel SP_B, andthe sub-pixel SP_G are defined by the first lines 360 and the secondlines 370. That is, closed areas on the substrate 310 defined by the twofirst lines 360 extended in the first direction and the two second lines370 extended in the second direction correspond to the respectivesub-pixels SP_R, SP_W, SP_B, and SP_G. The red sub-pixel SP_R, the whitesub-pixel SP_W, the blue sub-pixel SP_B, and the sub-pixel SP_G may bedefined by the first lines 360 and the second lines 370, but the presentinvention is not limited thereto. A sub-pixel may also be included whenthe first lines 360 or the second lines 370 share at least onesub-pixel.

The red sub-pixel SP_R, the white sub-pixel SP_W, the blue sub-pixelSP_B, and the sub-pixel SP_G respectively include the light emittingareas EA_R, EA_W, EA_B, and EA_G in which organic the light emittingelements are disposed to emit lights to the outside of the organic lightemitting display device 300 and the driving areas DA_R, DA_W, DA_B, andDA_G in which driving elements such as the thin film transistors 320 fordriving the organic light emitting elements are disposed.

The organic light emitting elements respectively disposed in the lightemitting areas EA_R, EA_W, EA_B, and EA_G of the red sub-pixel SP_R, thewhite sub-pixel SP_W, the blue sub-pixel SP_B, and the sub-pixel SP_Ginclude anodes 331R, 331W, 331B, and 331G, organic light emittinglayers, and cathodes, respectively. If the organic light emittingdisplay device 300 is a bottom-emission organic light emitting displaydevice, the anodes 331R, 331W, 331B, and 331G are formed of atransparent conductive material having a high work function value andthe cathodes are formed of a reflective metallic material having a lowwork function value. The organic light emitting layers are organic lightemitting layers for emitting white lights. Lights emitted from theorganic light emitting layers pass through color filters and are emittedtoward the bottom of the substrate 310 on which the thin filmtransistors 320 is formed. However, a light emitted from the organiclight emitting layer of the white sub-pixel SP_W does not pass throughthe color filter and is emitted toward the bottom of the substrate 310.In FIG. 3, illustration of the organic light emitting layers, thecathodes, and the color filters is omitted for convenience inexplanation, but only the anodes 331R, 331W, 331B, and 331G disposed onthe respective sub-pixels SP_R, SP_W, SP_B, and SP_G are illustrated.

Although not illustrated in the drawing, the organic light emittinglayer may be formed of two light emitting layers including a blue lightemitting layer and a yellow-green light emitting layer so as to emit awhite light. In this case, the blue sub-pixel SP_B or the whitesub-pixel SP_W may be configured to have a shape extending into the redsub-pixel SP_R or the green sub-pixel SP_G. Therefore, a size of thelight emitting area EA_B of the blue sub-pixel SP_B or a size of thelight emitting area EA_W of the white sub-pixel SP_W may be greater thana size of the light emitting area EA_R of the red sub-pixel SP_R or asize of the light emitting area EA_G of the green sub-pixel SP_G. Thus,efficiency and luminance of the blue sub-pixel SP_B can be improved.Otherwise, in order to further improve efficiency of the blue sub-pixelSP_B, a size of the light emitting area EA_B of the blue sub-pixel SP_Bcan be much greater than a size of the light emitting area EA_W of thewhite sub-pixel SP_W. Herein, the blue light emitting layer may includea blue light emitting layer, a sky blue light emitting layer, and a deepblue light emitting layer. Further, the blue light emitting layer mayhave an emission wavelength in a range of 440 nm to 480 nm. Theyellow-green light emitting layer may have an emission wavelength in arange of 510 nm to 580 nm.

Further, the organic light emitting layer may be formed of three lightemitting layers including a blue light emitting layer a yellow-greenlight emitting layer, and a blue light emitting layer so as to emit awhite light. In this case, the organic light emitting layer includes twoblue light emitting layers, and, thus, both emission efficiency of theblue light emitting layer and life of the blue light emitting layers canbe improved. In this case, the blue sub-pixel SP_B or the whitesub-pixel SP_W may be configured to have a shape extending into the redsub-pixel SP_R or the green sub-pixel SP_G. Therefore, a size of thelight emitting area EA_B of the blue sub-pixel SP_B or a size of thelight emitting area EA_W of the white sub-pixel SP_W may be greater thana size of the light emitting area EA_R of the red sub-pixel SP_R or asize of the light emitting area EA_G of the green sub-pixel SP_G.Otherwise, the white sub-pixel SP_W may be configured to have a shapeextending into the blue sub-pixel SP_B, and the blue sub-pixel SP_B maybe configured to have a shape extending into the green sub-pixel.Therefore, a size of the light emitting area EA_B of the blue sub-pixelSP_B or a size of the light emitting area EA_W of the white sub-pixelSP_W may be greater than a size of the light emitting area EA_R of thered sub-pixel SP_R or a size of the light emitting area EA_G of thegreen sub-pixel SP_G. Otherwise, efficiency or luminance of the whitesub-pixel SP_W can be improved by setting a size of the white sub-pixelSP_W to be greater than that of the blue sub-pixel SP_B. Alternatively,efficiency or luminance of the red sub-pixel SP_R can be furtherimproved by setting a size of the red sub-pixel SP_R to be greater thanthat of the green sub-pixel SP_G. Herein, the blue light emitting layermay include a blue light emitting layer, a sky blue light emittinglayer, and a deep blue light emitting layer. Further, the blue lightemitting layer may have an emission wavelength in a range of 440 nm to480 nm. Further, the yellow-green light emitting layer may have anemission wavelength in a range of 510 nm to 580 nm. Furthermore, asequence of the organic light emitting layers can be determined on thebasis of the characteristic or a structure of the product. For example,if the organic light emitting layer is formed of two light emittinglayers including a blue light emitting layer and a yellow-green lightemitting layer, the blue light emitting layer may be configured to beclose to an anode or the yellow-green light emitting layer may beconfigured to be close to an anode. Further, if the organic lightemitting layer is formed of three light emitting layers including a bluelight emitting layer, a yellow-green light emitting layer, and a bluelight emitting layer, the blue light emitting layer, the yellow-greenlight emitting layer, and the blue light emitting layer may be disposedin sequence on an anode. Otherwise, the blue light emitting layer, theblue light emitting layer, and the yellow-green light emitting layer maybe disposed in sequence on an anode. Alternatively, the yellow-greenlight emitting layer, the blue layer, and the blue layer may be disposedin sequence on an anode.

In order to improve emission efficiency of a red sub-pixel, a red lightemitting layer may be further formed. If there are two light emittinglayers including a blue light emitting layer and a yellow-green lightemitting layer, a red light emitting layer may be further formed at theblue light emitting layer. If the blue light emitting layer is formed soas to be closer to the anode than the yellow-green light emitting layer,a red light emitting layer may be formed on the blue light emittinglayer, which may be more advantageous in improving color reproductionratio or color purity of the organic light emitting display device. Ifthe yellow-green light emitting layer is formed so as to be closer tothe anode than to the blue light emitting layer, a red light emittinglayer may be formed under the blue light emitting layer, which may bemore advantageous in improving the color reproduction ratio or colorpurity of the organic light emitting display device. Further, a redlight emitting layer may be further formed on the yellow-green lightemitting layer. If a red light emitting layer is further formed, asuitable position of the red light emitting layer may vary depending onan effect on improving the color reproduction ratio or color purity ofthe organic light emitting display device.

Further, even if there are three light emitting layers including a bluelight emitting layer, a yellow-green light emitting layer, and a bluelight emitting layer, a red light emitting layer may be further formedat the blue light emitting layer. If a red light emitting layer isfurther formed at the blue light emitting layer closer to the anode, thered light emitting layer may be formed on the blue light emitting layer,which may be more advantageous in improving the color reproduction ratioor color purity of the organic light emitting display device. If a redlight emitting layer is further formed at the blue light emitting layercloser to the cathode, the red light emitting layer may be formed underthe blue light emitting layer, which may be more advantageous toimproving the ratio of color reproduction or color purity of the organiclight emitting display device. Further, if a red light emitting layer isfurther formed at the yellow-green light emitting layer, the red lightemitting layer may be formed under the yellow-green light emittinglayer, which may be more advantageous to improving the colorreproduction ratio or color purity. Furthermore, if the blue lightemitting layer, the blue light emitting layer, and the yellow-greenlight emitting layer are formed in sequence on the anode, a red lightemitting layer may be formed under the blue light emitting layer or theyellow-green light emitting layer. Further, if the yellow-green lightemitting layer, the blue light emitting layer, and the light emittinglayer are formed in sequence on the anode, a red light emitting layermay be formed under the yellow-green light emitting layer. Otherwise, ared light emitting layer may be formed on the blue light emitting layercloser to the anode. Alternatively, a red light emitting layer may beformed on the blue light emitting layer closer to the cathode. That is,if a red light emitting layer is added, the red light emitting layer maybe disposed at a position suitable for improving the color reproductionratio or color purity of the organic light emitting display device, anda position of the red light emitting layer may be determined in variousways.

Therefore, regardless of light emitting layers constituting organiclight emitting layers, the present invention can provide an organiclight emitting display device improved in life by increasing a size of alight emitting area of a sub-pixel having a short life or a lowefficiency as compared with other sub-pixels.

Further, light emitting layers constituting organic light emittinglayers may be configured in various ways depending on characteristics ofan organic light emitting display device. Therefore, the presentinvention can provide an organic light emitting display device improvedin life or other characteristics by increasing a size of a lightemitting area of a sub-pixel having a short life and inferiorcharacteristics of an organic light emitting display device as comparedwith other sub-pixels in consideration of characteristics of an organiclight emitting display device, such as an aperture ratio, life,luminance, reliability, color reproduction ratio, and color purity. Banklayers can define the light emitting areas EA_R, EA_W, EA_B, and EA_G ofthe sub-pixels SP_R, SP_W, SP_B, and SP_G, respectively. That is, in therespective sub-pixels SP_R, SP_W, SP_B, and SP_G, the areas covered bythe bank layers can be defined as the driving areas DA_R, DA_W, DA_B,and DA_G and the areas which are not covered by the bank layers can bedefined as the light emitting areas EA_R, EA_W, EA_B, and EA_G. SinceFIG. 3 is a plane view, the bank layers are not illustrated in FIG. 3,and the light emitting areas EA_R, EA_W, EA_B, and EA_G and the drivingareas DA_R, DA_W, DA_B, and DA_G are schematically indicated by dottedlines.

Referring to FIG. 3, a space S1 between the second lines 370 definingthe driving area DA_R of the red sub-pixel SP_R, a space S2 between thesecond lines 370 defining the driving area DA_W of the white sub-pixelSP_W, a space S3 between the second lines 370 defining the driving areaDA_B of the blue sub-pixel SP_B, and a space S4 between the second lines370 defining the driving area DA_G of the red sub-pixel SP_G areidentical to each other. That is, the second lines 370 defining thedriving areas DA_R, DA_W, DA_B, and DA_G of the respective sub-pixelsSP_R, SP_W, SP_B, and SP_G are equally spaced apart. Therefore, therespective sub-pixels SP_R, SP_W, SP_B, and SP_G are defined by thesecond lines 370, and, thus, first directional widths of the drivingarea DA_R of the red sub-pixel SP_R, the driving area DA_W of the whitesub-pixel SP_W, the driving area DA_B of the blue sub-pixel SP_B, andthe driving area DA_G of the red sub-pixel SP_G are identical to eachother.

A maximum space S6 between the second lines 370 defining the lightemitting area EA_W of the white sub-pixel SP_W is greater than a minimumspace S5 between the second lines 370 defining the light emitting areaEA_R of the red sub-pixel SP_R adjacent to the white sub-pixel SP_W.That is, the second line which defines the light emitting area EA_W ofthe white sub-pixel SP_W that also defines the light emitting area EA_Rof the red sub-pixel SP_R includes a slanted portion with respect to thefirst direction and the second direction such that the light emittingarea EA_W of the white sub-pixel SP_W includes a portion extending intothe red sub-pixel SP_R.

Further, a maximum space S7 between the second lines 370 defining thelight emitting area EA_B of the blue sub-pixel SP_B is greater than aminimum space S8 between the second lines 370 defining the lightemitting area EA_G of the green sub-pixel SP_G adjacent to the bluesub-pixel SP_B. That is, the second line which defines the lightemitting area EA_B of the white blue sub-pixel SP_B that also definesthe light emitting area EA_G of the green sub-pixel SP_G includes aslanted portion with respect to the first direction and the seconddirection such that the light emitting area EA_B of the blue sub-pixelSP_B includes a portion extending into the green sub-pixel SP_G.

As described above, the second lines 370 defining the driving areasDA_R, DA_W, DA_B, and DA_G of the respective sub-pixels SP_R, SP_W,SP_B, and SP_G are equally spaced apart, and the light emitting areaEA_W of the white sub-pixel SP_W and the light emitting area EA_B of theblue sub-pixel SP_B include the portions extending into the redsub-pixel SP_R and the green sub-pixel SP_G, respectively. Therefore,the space S3 between the second lines 370 defining the driving area DA_Bof the blue sub-pixel SP_B is smaller than the maximum space S7 betweenthe second lines 370 defining the light emitting area EA_B of the bluesub-pixel SP_B. The space S2 between the second lines 370 defining thedriving area DA_W of the white sub-pixel SP_W is smaller than themaximum space S6 between the second lines 370 defining the lightemitting area EA_W of the white sub-pixel SP_W. In the same principle,the space S1 between the second lines 370 defining the driving area DA_Rof the red sub-pixel SP_R is greater than the minimum space S5 betweenthe second lines 370 defining the light emitting area EA_R of the redsub-pixel SP_R. The space S4 between the second lines 370 defining thedriving area DA_G of the green sub-pixel SP_G is greater than theminimum space S8 between the second lines 370 defining the lightemitting area EA_G of the green sub-pixel SP_G.

Referring to FIG. 3, a size of the light emitting area EA_B of the bluesub-pixel SP_B and a size of the light emitting area EA_W of the whitesub-pixel SP_W are greater than a size of the light emitting area EA_Gof the green sub-pixel SP_G and a size of the light emitting area EA_Rof the red sub-pixel SP_R, respectively. This is because the lightemitting area EA_B of the blue sub-pixel SP_B and the light emittingarea EA_W of the white sub-pixel SP_W include the areas extending intothe red sub-pixel SP_R and the green sub-pixel SP_G, respectively.

In the organic light emitting display device 300 according to theexemplary embodiment of the present invention, it is possible to securedesired sizes of the light emitting areas EA_R, EA_W, EA_B, and EA_G ofthe respective sub-pixels SP_R, SP_W, SP_B, and SP_G by changing onlythe lines defining the light emitting areas EA_R, EA_W, EA_B, and EA_Gof the respective sub-pixels SP_R, SP_W, SP_B, and SP_G without changinga size of the optimally designed pixel P or sizes of the driving areasDA_R, DA_W, DA_B, and DA_G of the respective sub-pixels SP_R, SP_W,SP_B, and SP_G. That is, as illustrated in FIG. 3, a size of the lightemitting area EA_W of the white sub-pixel SP_W is secured by allowingthe second line 370 disposed between the light emitting area EA_W of thewhite sub-pixel SP_W and the light emitting area EA_R of the redsub-pixel SP_R to include an slanted portion. A Size of the lightemitting area EA_B of the blue sub-pixel SP_B is secured by allowing thesecond line 370 disposed between the light emitting area EA_B of theblue sub-pixel SP_B and the light emitting area EA_G of the greensub-pixel SP_G to include a slanted portion. Therefore, a size of thelight emitting area EA_W of the white sub-pixel SP_W can be increasedwithout changing the driving areas DA_R, DA_W, DA_B, and DA_G of therespective sub-pixels SP_R, SP_W, SP_B, and SP_G, and, thus, overallluminance of the organic light emitting display device 300 can beimproved. Further, a size of the light emitting area EA_B of the bluesub-pixel SP_B can be increased without changing the driving areas DA_R,DA_W, DA_B, and DA_G of the respective sub-pixels SP_R, SP_W, SP_B, andSP_G, and, thus, life of the blue sub-pixel SP_B having a shorter lifethan that of other sub-pixels can be improved. Otherwise, by increasinga size of a sub-pixel having a shorter life than the other sub-pixelsdepending on a structure or characteristics of an element, life of thesub-pixel having a shorter life can be improved.

In some exemplary embodiments, a size of the light emitting area EA_W ofthe white sub-pixel SP_W may be greater than a size of the lightemitting area EA_R of the red sub-pixel SP_R, a size of the lightemitting area EA_B of the blue sub-pixel SP_B, and a size of the lightemitting area EA_G of the green sub-pixel SP_G. That is, by setting thelight emitting area EA_W of the white sub-pixel SP_W to have a greatersize than that of the light emitting areas EA_R, EA_G, and EA_B of theother sub-pixels SP_R, SP_G, and SP_B, luminance of the organic lightemitting display device 300 can be further improved.

In some exemplary embodiments, sizes of the light emitting areas EA_W,EA_R, EA_G, and EA_B of the respective sub-pixels SP_W, SP_R, SP_G, andSP_B can be determined on the basis of efficiency of the organic lightemitting elements disposed in the respective sub-pixels SP_W, SP_R,SP_G, and SP_B. That is, a size of a light emitting area of a sub-pixelhaving a relatively low efficiency of an organic light emitting elementmay be set to be greater than a size of a light emitting area of asub-pixel having a relatively high efficiency of an organic lightemitting element. For example, efficiency of an organic light emittingelement is determined by a laminated structure of organic light emittinglayers constituting an organic light emitting element, materials of anorganic light emitting layer, and the like. If an organic light emittinglayers have a low efficiency, life of the organic light emitting layersmay be reduced. Thus, by setting a size of a light emitting area of asub-pixel having a relatively low efficiency of an organic lightemitting element to be greater than a size of a light emitting area of asub-pixel having a relatively high efficiency of an organic lightemitting element, life of an organic light emitting display device maybe improved. Although FIG. 3 illustrates only driving thin filmtransistors among various driving elements for driving an organic lightemitting element for convenience in explanation, switching thin filmtransistors or thin film transistors for compensation, or variouscapacitors may be included in driving elements and disposed in thedriving areas DA_R, DA_W, DA_B, and DA_G of the respective sub-pixelsSP_R, SP_W, SP_B, and SP_G. Thus, the second lines 370 may include notonly data lines but also Vdd lines or Vref lines. If the second lines370 are of various kinds as such, the second lines 370 for defining therespective sub-pixels SP_R, SP_W, SP_B, and SP_G may be defined as thesecond lines closest to the left sides and the right sides of therespective sub-pixels SP_R, SP_W, SP_B, and SP_G.

FIG. 4 and FIG. 5 are plane views provided to describe organic lightemitting display devices according to various exemplary embodiments ofthe present invention. As compared with the organic light emittingdisplay device 300 illustrated in FIG. 3, in organic light emittingdisplay devices 400 and 500 illustrated in FIG. 4 and FIG. 5,respectively, positions of blue sub-pixels SP_B and green sub-pixelsSP_G, shapes of the second lines 470 and 570, sizes of light emittingareas EA_W of white sub-pixels SP_W, and sizes of area of anodes 431B,431G, 531W, 531G, and 531B are changed. Thus, redundant explanation ofsubstantially the same components will be omitted.

Referring to FIG. 4 first, a white sub-pixel SP_W and a blue sub-pixelSP_B may not be adjacent to each other, and other sub-pixels SP_R, SP_W,SP_B, and SP_G may be positioned between the white sub-pixel SP_W andthe blue sub-pixel SP_B. As illustrated in FIG. 4, a green sub-pixelSP_G may be positioned between the white sub-pixel SP_W and the bluesub-pixel SP_B, and a red sub-pixel SP_R may be positioned between thewhite sub-pixel SP_W and the blue sub-pixel SP_B. Since the whitesub-pixel SP_W and the blue sub-pixel SP_B having relatively large lightemitting areas EA_ are disposed so as not to be adjacent to each other,it may be easier to secure sizes of a light emitting area EA_ of thewhite sub-pixel SP_W and a light emitting area EA_ of the blue sub-pixelSP_B.

Then, referring to FIG. 5, all of second lines 570 defining a lightemitting area EA_W of a white sub-pixel SP_W may include slantedportions with respect to a first direction and a second direction. Ifonly the second line 570 positioned at one side of the light emittingarea EA_W of the white sub-pixel SP_W is changed, a size of onesub-pixel SP_R, SP_W, SP_B, or SP_G, i.e., a size of a light emittingarea EA_R of a red sub-pixel SP_R, needs to be reduced to secure a sizeof the light emitting area EA_W of the white sub-pixel SP_W. However,there may be a limit in reducing a size of the light emitting area EA_Rof the red sub-pixel SP_R. Therefore, as illustrated in FIG. 5, the sizeof the light emitting area EA_W of the white sub-pixel SP_W may befurther reliably secured by changing shapes of second lines 570positioned on both sides of the light emitting area EA_W of the whitesub-pixel SP_W.

Although FIG. 5 only illustrates an exemplary embodiment in which shapesof the second lines 570 positioned on both sides of the light emittingarea EA_W of the white sub-pixel SP_W are changed for convenience inexplanation, if necessary, shapes of the second lines 570 positioned onboth sides of the light emitting area EA_B of the blue sub-pixel SP_Bmay be changed together with the second lines 570 positioned on bothsides of the light emitting area EA_W of the white sub-pixel SP_Willustrated in FIG. 5.

FIG. 6 is a plane view provided to describe an organic light emittingdisplay device according to an exemplary embodiment of the presentinvention. As compared with the organic light emitting display device300 illustrated in FIG. 3, in an organic light emitting display device600 illustrated in FIG. 6, sizes of a red sub-pixel SP_R, a greensub-pixel SP_G, a blue sub-pixel SP_B, and a white sub-pixel SP_W,shapes of second lines 670, and sizes of light emitting areas EA_R,EA_G, EA_B, and EA_W and anodes 631R, 631G, 631B, and 631W of therespective sub-pixel SP_R, green sub-pixel SP_G, blue sub-pixel SP_B,and white sub-pixel SP_W are changed. Thus, redundant explanation ofsubstantially the same components will be omitted.

Referring to FIG. 6, the light emitting area EA_R of the red sub-pixelSP_R includes a portion extending into the white sub-pixel SP_W. Thatis, among second lines 670 defining the light emitting area EA_R of thered sub-pixel SP_R, a second line 670 disposed between the red sub-pixelSP_R and the white sub-pixel SP_W includes a portion extending into thewhite sub-pixel SP_W and slanted with respect to a first direction and asecond direction.

The light emitting area EA_W of the white sub-pixel SP_W includes aportion extending into the blue sub-pixel SP_B. That is, among secondlines defining the light emitting area EA_W of the white sub-pixel SP_W,a second line 670 disposed between the white sub-pixel SP_W and the bluesub-pixel SP_B includes a portion extending into the blue sub-pixel SP_Band slanted portion with respect to the first direction and the seconddirection. Herein, a degree of a portion extending into the bluesub-pixel SP_B in the second line 670 between the white sub-pixel SP_Wand the blue sub-pixel SP_B is larger than a degree a portion extendinginto the white sub-pixel SP_W in the second line 670 between the redsub-pixel SP_R and the white sub-pixel SP_W.

The light emitting area EA_B of the blue sub-pixel SP_B includes aportion extending into the green sub-pixel SP_G. That is, among secondlines defining the light emitting area EA_B of the blue sub-pixel SP_B,a second line 670 disposed between the blue sub-pixel SP_B and the greensub-pixel SP_G includes a portion extending into the green sub-pixelSP_G and slanted portion with respect to the first direction and thesecond direction. Herein, a degree of a portion extending into the greensub-pixel SP_G in the second line 670 between the blue sub-pixel SP_Band the green sub-pixel SP_G is lower than a degree of a portionextending into the blue sub-pixel SP_B in the second line 670 betweenthe white sub-pixel SP_W and the blue sub-pixel SP_B.

According to the arrangements of the second lines 670 as describedabove, the light emitting area EA_W of the white sub pixel SP_W has thegreatest size. A size of a light emitting area is decreased in sequencefrom the light emitting area EA_R of the red sub pixel SP_R, the lightemitting area EA_B of the blue sub pixel SP_B to the light emitting areaEA_G of the green sub pixel SP_G. Thus, by setting the light emittingarea EA_W of the white sub pixel SP_W to have a greater size than thelight emitting areas EA_R, EA_G, and EA_B of the other sub-pixels SP_R,SP_G, and SP_B, luminance of the organic light emitting display device600 can be further improved.

Further, for example, if an organic light emitting element disposed onthe green sub-pixel SP_G has a relatively high efficiency and an organiclight emitting element on the red sub-pixel SP_R has a relatively lowefficiency, as illustrated in FIG. 6, a size of the light emitting areaEA_R of the red sub-pixel SP_R is increased and a size of the lightemitting area EA_G of the green sub-pixel SP_G is decreased, and, thus,life of the organic light emitting display device can be improved.

The arrangements of the sub-pixels SP_R, SP_W, SP_B, and SP_Gillustrated in FIG. 3 to FIG. 6 are randomly set for convenience inexplanation, and the exemplary embodiments of the present invention arenot limited to the arrangements of the sub-pixels SP_R, SP_W, SP_B, andSP_G illustrated in FIG. 3 to FIG. 6. That is, in order to secure a sizeof the light emitting area EA_B of the blue sub-pixel SP_B and a size ofthe light emitting area EA_W of the white sub-pixel SP_W, the redsub-pixel SP_R, the white sub-pixel SP_W, the blue sub-pixel SP_B, andthe green sub-pixel SP_G may be set within a range in which a portion ofthe second line 670 can be formed so as to be slanted.

As described above, an aspect of the present invention provides anorganic light emitting display device in which each sub-pixel has anoptimum size of a light emitting area in a state where a size of a pixeland a size of a driving area are determined on the basis of resolutionof the organic light emitting display device. Further, an aperture ratiois secured without making a change in a driving area, and, thus, it ispossible to provide an organic light emitting display device improved inreliability of an element. In addition, since a size of a light emittingarea of each white sub-pixel is defined to be greater than areas oflight emitting areas of the other sub-pixels, and, thus, it is possibleto provide an organic light emitting display device improved in life andreliability. Also, since an aperture ratio can be secured, it ispossible to provide an organic light emitting display device which isimproved in luminance and life that can be applied to a large-screen TV.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the organic light emittingdisplay device of the present invention without departing from thespirit or scope of the invention. Thus it is intended that the presentinvention cover the modifications and variations of this inventionprovided they come within the scope of the appended claims and theirequivalents.

What is claimed is:
 1. An organic light emitting display device,comprising: a plurality of pixels on a substrate; a plurality of firstlines extending in the first direction on the substrate; and a pluralityof second lines intersecting the plurality of first lines and extendingin a second direction on the substrate, the second direction beingperpendicular to the first direction, wherein each of the plurality ofpixels includes a plurality of sub-pixels, each of the plurality ofsub-pixels includes a light emitting area and a driving area, widths ina first direction of the driving areas of the plurality of sub-pixelsare identical to each other, a size of a light emitting area of a firstsub-pixel of the plurality of sub-pixels is greater than a size of alight emitting area of a second sub-pixel of the plurality ofsub-pixels, a width in the first direction of a light emitting area ofthe first sub-pixel is greater than a width in the first direction of alight emitting area of the second sub-pixel, and a space between thesecond lines defining the driving area of the first sub-pixel is smallerthan a maximum space between the second lines defining the lightemitting area of the first sub-pixel.
 2. The organic light emittingdisplay device according to claim 1, wherein a space between the secondlines defining the driving area of the second sub-pixel is greater thana minimum space between the second lines defining the light emittingarea of the second sub-pixel.
 3. The organic light emitting displaydevice according to claim 1, wherein at least one of the second linesdefining the first sub-pixel includes a slanted portion with respect tothe second direction.
 4. The organic light emitting display deviceaccording to claim 3, wherein the first sub-pixel is a white sub-pixelor a blue sub-pixel.
 5. The organic light emitting display deviceaccording to claim 1, wherein the plurality of pixels include a redsub-pixel, a white sub-pixel, a blue sub-pixel, and a green sub-pixel,and wherein the white sub-pixel includes a portion extending toward thered sub-pixel, and the blue sub-pixel includes a portion extendingtoward the green sub-pixel.
 6. The organic light emitting display deviceaccording to claim 1, wherein the plurality of pixels include a redsub-pixel, a white sub-pixel, a blue sub-pixel, and a green sub-pixel,and wherein the white sub-pixel includes a portion extending toward theblue sub-pixel, and the blue sub-pixel includes a portion extendingtoward the green sub-pixel.
 7. The organic light emitting display deviceaccording to claim 1, wherein the plurality of pixels include a redsub-pixel, a white sub-pixel, a blue sub-pixel, and a green sub-pixel,and wherein the white sub-pixel includes a portion extending toward thered sub-pixel and the green sub-pixel, and the blue sub-pixel includes aportion extending toward the green sub-pixel.
 8. The organic lightemitting display device according to claim 1, wherein the plurality ofpixels include a red sub-pixel, a white sub-pixel, a blue sub-pixel, anda green sub-pixel, and wherein the white sub-pixel includes a portionextending toward the blue sub-pixel, the blue sub-pixel includes aportion extending toward the green sub-pixel, and the red sub-pixelincludes a portion extending toward the white sub-pixel.
 9. The organiclight emitting display device according to claim 1, wherein theplurality of pixels include a red sub-pixel, a white sub-pixel, a bluesub-pixel, and a green sub-pixel, and wherein the red sub-pixel isadjacent to the white sub-pixel, the white sub-pixel is adjacent to theblue sub-pixel, and the blue sub-pixel is adjacent to the greensub-pixel.
 10. The organic light emitting display device according toclaim 1, wherein the plurality of sub-pixels include a red sub-pixel, awhite sub-pixel, a blue sub-pixel, and a green sub-pixel, and whereinthe red sub-pixel is adjacent to the white sub-pixel, the whitesub-pixel is adjacent to the green sub-pixel, and the green sub-pixel isadjacent to the blue sub-pixel.
 11. The organic light emitting displaydevice according to claim 1, wherein the plurality of pixels include ared sub-pixel, a white sub-pixel, a blue sub-pixel, and a greensub-pixel, and the second lines defining the driving area of the redsub-pixel, the driving area of the white sub-pixel, the driving area ofthe blue sub-pixel, and the driving area of the green sub-pixel areequally spaced apart.
 12. An organic light emitting display device,comprising: a plurality of pixels on a substrate, wherein each of theplurality of pixels includes a plurality of sub-pixels, each of theplurality of sub-pixels includes a light emitting area and a drivingarea, widths in a first direction of the driving areas of the pluralityof sub-pixels are identical to each other, and a size of a lightemitting area of a first sub-pixel of the plurality of sub-pixels isgreater than a size of a light emitting area of a second sub-pixel ofthe plurality of sub-pixels, wherein the plurality of sub-pixels includea red sub-pixel, a white sub-pixel, a blue sub-pixel, and a greensub-pixel, and the blue sub-pixel or the white sub-pixel is a firstsub-pixel, and the red sub-pixel or the green sub-pixel is a secondsub-pixel, and wherein the white sub-pixel includes a portion extendingtoward the blue sub-pixel, the blue sub-pixel includes a portionextending toward the green sub-pixel, and the red sub-pixel includes aportion extending toward the white sub-pixel.
 13. The organic lightemitting display device according to claim 12, further comprising: aplurality of first lines extending in the first direction on asubstrate; and a plurality of second lines intersecting the plurality offirst lines and extending in a second direction on the substrate, thesecond direction being perpendicular to the first direction.
 14. Theorganic light emitting display device according to claim 13, wherein aspace between the second lines defining the driving area of the bluesub-pixel is smaller than a maximum space between the second linesdefining the light emitting area of the blue sub-pixel, and a spacebetween the second lines defining the driving area of the whitesub-pixel is smaller than a maximum space between the second lines ofthe light emitting area of the white sub-pixel.
 15. The organic lightemitting display device according to claim 13, wherein a space betweenthe second lines defining the driving area of the red sub-pixel isgreater than a minimum space between the second lines defining the lightemitting area of the red sub pixel, and a space between the second linesdefining the driving area of the green sub-pixel is greater than aminimum space between the second lines of the light emitting area of thegreen sub-pixel.
 16. The organic light emitting display device accordingto claim 13, wherein at least one of the second lines defining the whitesub-pixel or the blue sub-pixel includes a slanted portion with respectto the second direction.
 17. The organic light emitting display deviceaccording to claim 12, wherein the size of the light emitting area ofthe white sub-pixel is greater than the size of the light emitting areaof the red sub-pixel, the size of the light emitting area of the bluesub-pixel, and the size of the light emitting area of the greensub-pixel, respectively.
 18. The organic light emitting display deviceaccording to claim 12, wherein the size of the light emitting area ofthe white sub-pixel or the size of the light emitting area of the bluesub-pixel is greater than the size of the light emitting area of the redsub-pixel or the size of the light emitting area of the green sub-pixel.19. The organic light emitting display device according to claim 12,wherein the red sub-pixel is adjacent to the white sub-pixel, the whitesub-pixel is adjacent to the blue sub-pixel, and the blue sub-pixel isadjacent to the green sub-pixel.
 20. The organic light emitting displaydevice according to claim 12, wherein the red sub-pixel is adjacent tothe white sub-pixel, the white sub-pixel is adjacent to the greensub-pixel, and the green sub-pixel is adjacent to the blue sub-pixel.21. A display device comprising: an array of pixels with each pixelhaving sub-pixels, each of the sub-pixels divided into a light emittingarea having an organic light emitting element and a driving area havingdriving elements that drive the organic light emitting element; aplurality of first lines extending in the first direction; and aplurality of second lines intersecting the plurality of first lines andextending in a second direction on the substrate, the second directionbeing perpendicular to the first direction, wherein each of thesub-pixels is configured to have a particular aperture ratio, which isoptimized in view of the driving area having a prescribed size, inconsideration of each of the pixels having a prescribed size to achievea specific resolution for the display device, wherein a space betweenthe second lines defining the driving area of the first sub-pixel issmaller than a maximum space between the second lines defining the lightemitting area of the first sub-pixel, wherein the particular apertureratio is optimized by configuring at least a portion of a width of aparticular sub-pixel in each of the pixels to be greater than that ofanother sub-pixel in that pixel, and wherein the greater width of theparticular sub-pixel results in at least one portion of a data line ofthe second lines, passing along an edge of the particular sub-pixel,being bent away from a lengthwise direction of the entire data line. 22.The display device of claim 21, wherein the particular aperture ratiofor respective sub-pixels in each of the pixels are achieved withoutmaking changes to the prescribed size of each of the pixels and theprescribed size of the driving area of the respective sub-pixels. 23.The display device of claim 21, wherein the size of each driving areafor each of the sub-pixels is identical to one another.
 24. The displaydevice of claim 23, wherein the size of the emitting area of each of thesub-pixels is based upon a current required for that sub-pixel or anefficiency of the organic light emitting element in that sub-pixel. 25.The display device of claim 12, wherein the white sub-pixel includes aportion extending toward the red sub-pixel, and the blue sub-pixelincludes a portion extending toward the green sub-pixel.
 26. The displaydevice of claim 12, wherein the white sub-pixel includes a portionextending toward the red sub-pixel and the green sub-pixel, and the bluesub-pixel includes a portion extending toward the green sub-pixel.